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used by 80211b wireless devices effectively 2400 MHz 1/4 wavelength 117 inches, making for a very short antenna! A 1/4 wavelength antenna offers no signal gain and is also known as a unity-gain antenna Ideally, all of the power applied to the antenna is radiated as is in all directions above the ground-plane uniformly Making antennas with multiple 1/4 wavelength elements odd multiples (3, 5, 7, 9, etc) of 1/4 wavelength elements coupled together causes their radiation patterns to accumulate and compress, so that the antenna signal gains by forcing the radiation pattern into various shapes of focused patterns patterns of concentrated radio energy Since a 1/4 wavelength antenna for 24 GHz is so small, and offers little or no advantage to signal transmission or reception, you will find that most omnidirectional antennas for use at frequencies above 150 MHz are built and configured with multiple elements to provide signal radiation gain Other variations exist as well combining 1/4, 1/2, 5/8, or 3/4 wavelength elements in deliberate configurations to achieve typical signal gains of 5 6, 8 9, or 10 12 dB or more Most base station antennas for wireless services 24 GHz 80211b or 53 58 GHz 80211a are high signal gain devices Their physical size is several times longer than a 1/4 wavelength for their respective frequencies Beware that higher gain in antennas means the radiation pattern from these antennas is not as full (wide or tall) as omnidirectional antennas, as shown in Figure 44 The radiation pattern shrinks from a full, wide flood effect, extending from horizon to the sky, down to a narrower beam only 10 to 30 degrees wide The bottom of this beam is elevated up from the horizon and pushed down considerably from reaching the sky, thus forcing the power to only a few degrees above the horizon You can visualize this signal pattern compression much like deflating a basketball and pushing down on the top of it to reshape the ball pattern into a donut or bagel shape In extremely high-gain antennas, the pattern resembles a flattened bagel, or in extreme cases, a nearly flat pancake-like signal pattern This pattern shaping creates an umbrella under which there is low- or no-signal below the horizontal plane of the antenna and a void of signal above the antenna The pattern compression as you use higher gain antennas must be taken into account when selecting and installing different antennas specific to your desired coverage area More discussion of this consideration is provided in the Deploying Antennas and Feedline Cables section.

FIGURE 77 To terminate a wire, the wire is pressed down into the slot between the fingers of the 66block contact with a punchdown tool The optional 110 blade is also shown (Courtesy of The Siemon Company)

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Summary

Figure 44 The vertical radiation pattern of a highgain vertical groundplane antenna The radiating element is comparatively longer, providing more radiating surface area Note the compressed or elongated shape of the pattern less signal is available above and below the plane of the antenna versus a 1/4 wavelength unity gain antenna as more signal is forced out to the sides

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This was a long and difficult chapter But the UITableView is arguably the iPhone s most difficult, yet most important, view If you do not understand the UITableView and its associated classes, you do not understand iPhone programming In this chapter, you learned how to use a UITableView and its associated classes You learned how to implement a table view s delegate and data source in a custom class You also learned how to group a table and how to index it And you learned how to customize a table cell s appearance After learning how to implement a table and customize it, you then learned a technique for adding a table to a navigation controller contained in a tab This was a long task, but as it is such a ubiquitous layout pattern, it is a necessary task After learning this technique, you then learned how to add, move, and delete rows from a table

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